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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3197cafe1592f1505fa7cc2f59a236b4947f7b32a958bdcb6aba5e76231b0418' 
  AND token = 'gWT5L+xc/7BpI/zg4d0LLNd19M8YLmf9EUWFReoZLc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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