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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f9d01882a00a8d033f83ac0b253e5863a64f178ed248efd7facf376a72e8c32' 
  AND token = 'kjeFw4gHb2BQ0lwj7xEXa2epBqSCdv9adkk3PAApX9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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