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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ca2eaca146040585291ff0aa9094231654cb4d99d5fc3dc383644d7439d026a' 
  AND token = '/pCmgmTNrRROA1rA11bdKUFnRdWw0OuQmOCqQzmbaLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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