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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cdd27382d712cdc924d1009946b5d725d838c5608eb085f1c56bcd8247175ae' 
  AND token = 'eeMOnVtiz3LsdQC8W0am5hIMSqt9c1Vlw10hc6XjrxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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