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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1675148467ef30b9d4661c30423daa03c0059e6cb731ebec68ad5709d278da4f' 
  AND token = 'pMciahiZr0YtqTdJ75tj+8oMvWhzo+C5q6q78B7EJMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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