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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf3477e6199dd12ac9c0eba375ba44af58eb4fc2fcf8185b446e11a96d33ecae' 
  AND token = 'vwqPs+R2BklJglyx2CDPPDo/ThwdhrOqSUa2dr9etJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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