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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1d9c49486d68cffb083d9918ef2521d7eedef40c0315cfcb3a367c807f3317c' 
  AND token = 'tVxFBTOkhS3qPMszklnBanmkfrMc1Q4M31ZxtxQY3NU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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