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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4d9f4c931a81964e4cfa50d5d69511b81d8b71d1a16a3c58fc534d6ae1e9375' 
  AND token = '6nGcK84uzB6RgLIDa5i+J0cTOapTezNRbZDtaMI5vSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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