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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b3627c81509bf52382b336b9fa98a074ce816cc662f17a17d6f433c22969aee' 
  AND token = '7wjECdorPmf5/a4xdLU/wfRCJT5Al9JGTn371L2cW5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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