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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e900a3c5090247d47c972e3bf17c2301f21617b0e8c668a85e8233ae0a2f47e9' 
  AND token = '6i0vqFnDMxfzq+K0GjO/eI96mOMlxzDJ/S5n3wnn6GU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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