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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b573acce3bd8b535888d966fa54e1957f3bb704b8e96d5f5d43baab4cafa98e7' 
  AND token = '7SX4mUMjDtvRjJZP9pT8xyvTsE0VpoOT7pm4QMKDthY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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