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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cfe865cb03d95fc3e9d3cad1e5cc1707de4a589b01e3a9034b3f911815ffd9a' 
  AND token = 'kZe4HOMj5IZbHPIiexUwgUbFFOCK86E8ENwSh/KReYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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