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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29a73bbe21c13ee8ce48745dc54f8b3a6a41a6a8a07afc2dbca4258a641b05ba' 
  AND token = 'c7bPeZb7erEH662eoMGjRp/mdMGiCfEUXhpugL7DJtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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