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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99209a5500a07b802358b7eaa25e3db1fe89707996d73fb553b72902a29f4e36' 
  AND token = 'EUdmN8yiS7LP/kSNvPVWl4P7vKtlUOiiPP1zQCxlzYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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