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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aa4ab84c0974cb8f3c736ad09faddae6dbc77ec47a242a911c6066f5415d393' 
  AND token = '9al3EibNqYgLglkP+KZhRcj4pyqFwocjKWZt4yDUBdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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