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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7f4fc3d459144e8c0d8402f918750040c912ca5ca94db54d7cb8982f10e94ec' 
  AND token = 'Msp5wco5c0/DxK1j3P2x0q+FgDt5oP6WYAY8AkXV8p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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