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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cda336425946e92400e8a1e68498bca0b4e5960daa06e6503cce7b4e5450ee1c' 
  AND token = 'NUYfTVXWBNj7nunFe/gRCIws87/or7Vd8vCpQkVny2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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