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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a41608c9ea612c8b1e05064505b2eba7c7418c9c1f7b4be40a6ce2616ba236c5' 
  AND token = 'zkQzNN2GW5iWD+NRWNc7rWGacKEx6GOK0zaVvUkbF3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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