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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5b8961e8994c0536933bca9106a37c0b0f210b41dc8ac1480f1e388257678c1' 
  AND token = 'Gakr4z/jvIOEl3zYR5CDyLxzfA37gttT49Ef0VHVsjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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