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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94678456f4a84c03ae1194838a445b0cd0329e46c729890c31c898f235e32eb4' 
  AND token = 'xlTrErfPmG0W4GJ91DKBLAbJwKmfEjTxt7U6msRd6Zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}