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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '919309f95314cea8a40f944707a4688b9740a536dbd36b1f1118066e7f95835c' 
  AND token = '0Omj+dp/nQC6/98yLH0JwgLaNGrriiabGJ0890TIz30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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