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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9378496858b70edadb1a832b87ce11f65b13d4488f792c33ae6bd93ac1a43e94' 
  AND token = 'yOpnqTq4yjuhvwdsxJV3Chfs7NJ9g29YrjBdtklW8N0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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