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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cba48e36fe532900093da5b7e15b886364a38628baf691c3499e573c2923813f' 
  AND token = 'FUmwiusJMM3R6hCEa7LYz2j4rxVMLnl8kChcxrA6Zqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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