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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71cdf0b3d8b4fefe4d7a52137e96cf4a6b59c98410059adcdc64b7f7289f322d' 
  AND token = 'X17PI8LjRw37nahHjE4yBBDFyxlAa8DvTcBteUAf/gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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