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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '383486c28e2288fef73d6530edcd9341d53040a53d4d335eb1a8fcead63bb6bb' 
  AND token = 'pr/0Z27pKDQ655HDZJ7vyhPXRKPtu1B76hmoUx//NXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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