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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '025addd8691e3f5dc55a1c8667d9620bbe95560a880f1977ee439b341a57e2f2' 
  AND token = 'NriQVh/MzSWCM4h99PXb7ztndsbV9c8nFbeadsJ6yI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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