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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c08fea1ad0dcfec02fdbdbbca64f9c316500e0c66fbcd905b84f9233ad3f601f' 
  AND token = 'MysSoCP1ugUPVZIsAv0Q7XEiB2DHbetRQ2lRN1gq+wA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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