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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd88a69f0641034e545a7b477833eee86d69408b03141b6634ee16e8d25defba' 
  AND token = 'uEoRDaQD9ViYi2YVzB+cShc9r6/FHdUIpz2vpoX1OJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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