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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aba2c9a2651ca19f68d443e5742650224628f8605eaca5c2461cdac296d8554' 
  AND token = 'sjbK6eH/6ZCYD5tcTQrqoUgamEosCso2bzJhkoL/AHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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