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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db07ae1b5492c9d40a1b0dbaef49e05f97598aacacf5564075c16f3b6d728935' 
  AND token = 'LXP4kPkzanm3uRUZ5K1GsSVzH7646akS/S8wLXItzZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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