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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '054e8322970b7f0b8ede5b5681b1adcfbfcf20caae51874de891f3b8f455d40d' 
  AND token = '/LTXnSzzuGP/SD7rdDn0qqA7Rpzp7S+4zkean8ruRvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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