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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9b2fdd9c8ed8588c42e299f62109edb85e929a6ab5d39f8cd003395b00c0ccc' 
  AND token = 'Wso5+DiVF3tDhmoX+i4we74zywkhwdYnm6vXWrKF3ZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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