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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99d65cee634c7f152ab645ed7b6a7a8ec85810812f8b7e770e02338ca3b47c69' 
  AND token = 'EagkkXMOu8b25QELWXZ4ll7jCsbEp51OQbBOg5UqA1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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