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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19e60efc5023434d2cbdd41d834b090e4daf23ede8d53b93a11771597756cd94' 
  AND token = 'rg2QZo43oNPS4TgNSs3E9Dzv74c3Ve3y5gmYk38tLuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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