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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db1eb6a9fc3d20832fd139bc5d512d5ccc01b684c15f739a5f904d85fe1227b4' 
  AND token = 'oK2PUtaDWFs9ORa6Kfa7zrn0oIySeRr8XhVwhyvRg58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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