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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efbc7627c7964da1a0013f3b724e42ae8416e4df014aeb52a72df22ff08fe78d' 
  AND token = 'EKE3qmpEpCLwHtLxJEVk7piyDaoBNvxfbrHlfa3g28Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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