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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5bd266016fad712ebc5c87ed5e28ac8bca89487cca611e72809b3639862126c' 
  AND token = 'l3W+M6sCF2L4gCQHA7oSmZ9E7rEQBeUab2HjaT9VjGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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