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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd79ac4b23372420103aab5b2beeadf60e4e2c4f34999c5e707b5e870fc8ce6a1' 
  AND token = 'Mr0AbS1raLpmDBnHTlZqD8LaX89N29C84ImQNVcpiMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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