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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9bd840f7e03af3b7eb48d84dfa3817f4d137387458642cbf19bf0852cca3e6a' 
  AND token = 'Y7eGjgbzkjF9AgkgxrJeMXd3z/Vt/ptHHL0HbUbIgFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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