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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93b545cb65671d3f33c19e470352846fec374d940643840d9f9d433d96fd1ec4' 
  AND token = 'aVmrrv1YPBPLCd77NbmB3BbrGFkAH5E10+XzInA5c8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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