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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea121544da89c5e1b1e4ddc9ddd93f895e56efb0c8b4b7ba32e9bb4f7c30f5ee' 
  AND token = 'WQvjtZgblzgl3KVl0YTTEbjhM/yDX1hz7F1wTEhz/Do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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