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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baf9fbf34e98e1b3f5689c57ef3340b33023ad3151661c8e036e528e8d71a56d' 
  AND token = 'JqkApus+wgYTUHgLdlUuyUGKdUVsufiYXu4UsyTK6LM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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