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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bda86c82f22dfe9200f8cd1a171dc29b9dfdc4e1ab6b7fb1c45abf9d13010167' 
  AND token = 'xFaykNC4qHysqSAqAH6MkbUEyL2yhrWn5DVIjJ5DDvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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