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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42cc63e702fd4d696e57b412010ca78c0e0937f3b9dfd7eb692fb902364d19cc' 
  AND token = 'ZLggOSnBt7ggPlkF8yRiEymD9/o82+gTulrZZvV+vfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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