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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bacf1e19fcea41ca9aaad692824a3b52d44e7a446fef30bf3ecc8d9c1064ab15' 
  AND token = 'kmqAgcTnywkRC5z1TkK/WhqaBM9LqLgHNdKzKGIrcQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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