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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdb0ecfa1e6f4fb92fcded4ab3f02e1086f223dfab18ca06548c665ea4b19404' 
  AND token = 'Z6x1qrHy9WlspAA8ex1P0QFUcpbnSWM5B4oBaSDLxtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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