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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d02578de3f07db3fc4bee6b5582ea6aedc4c9fd7cc5ccc0dab263106c8ab948' 
  AND token = 'hu7DUxF5CiL18+PIXxJbSJDO0UavD0xC60DUADEN640=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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