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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df91f11eae3ca4b87327e7bfcf8054447e4560a41a020cca81ae69f1b9304e5a' 
  AND token = 'FV+3OXA5X/McZc0JlvDsElvNio4qwHaD3by8QsyH29o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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