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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6eccb81f041a7cc1a1230db5d4764f39fd3b0dc706bfdb8e2b9fc6419ddabff' 
  AND token = 'Viunsi79T5pJCpb0ehXqDvo2mwY07EnJguLzRskDn30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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