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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da6534c5bfaaabb349d659f44a06399a90e47729f640853f4aff8ba247bc84e0' 
  AND token = 'Y7X5WEYk1pyWbeKcR/tUNgaJckijDyZCkoKf+SStbuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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