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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79f57305f76384bedb2d6401ebb18ff010b2ce6dcd431de65cb42c492e56374f' 
  AND token = 'h4fQZ9Xqp9nk3Ixfe+b+7+ygjUhkgM8I0J67Feu7qHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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