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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '039020b1a393becbd505c0a90543fbaa9825f06d701632e74cf974de2ce695d8' 
  AND token = 'ifsDH2Ca6Yb7n6nd0bGtlJqjG9F0LU3YIht6TxqZvTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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