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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13b63fa49d2c04ff4c881eae157ea249b5d59d11c610077da2f1a0a081116914' 
  AND token = 'P4KZ7Dq6j0+fcssyBTC/J5lRkoDRkS4Qx/zPSHXiyV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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