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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d37cc564f96be01d81d439a5d22cac1ad5e55fcda7bc55b8a3428b656e90f88' 
  AND token = 'WolLZ7JQi+JeviVFg9V+c4HJ0f0Z6rRVIa8APDFYnxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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