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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61770eb6db86ab262eed9e8a60df8dd73e1e8285db999de38186987a84089484' 
  AND token = 'uKaqCJu8DaTP3B25y5wVtoL9ERvP1V65rdXoSR23MX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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