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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70543f337be7272375886646e5de9cee76162745b3370f0c8d09972399f8dd73' 
  AND token = 'MVyEMhz01p97p1pJ8cNh243dW/yfBbT/WugRaPGPCD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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