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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f171368a58fbd9b7ecee576e7796a00eb9f4eca561a5fb07eeea66d563216e28' 
  AND token = 'bYVBZ500wGSB9R7e9mTW5G750TKbA8KweivyfsC+UAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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