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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '921e0d20532f8980fb5159c075022ff3fc2784a0950e0e6e23be5f08b35872f9' 
  AND token = '8FD1Cmeo9R2sCqvLY3xNsEXJHIM62GsGVfnkfZTksvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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