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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d0e9773d8cdd804fbbc2fe6970a6eecd9a80d1c0acaf0b138508237a5ead4d7' 
  AND token = '17JYMUWW3I23X8o8PaPGN9gHT0NUoxJ2BfO2xg5Pjww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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