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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff91765fc40a35b477270dc3d19c73a0de4ad0af9db6fdca933ec50f3164ee10' 
  AND token = 'b58ykKb0HmGUURjB3HlPgGOJpI6ppngEP2aAsc3zx6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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