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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30e6f700cce92076278e168cc9457148e2e1cb64de290380ed4ce4b39a75b824' 
  AND token = 'y4oI5TEB3NOIhflYK8jIWqacLZiU0xvqmrUavCydm88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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