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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '323a740802c833ddfc227b6ead1074d1ea401e6b3a7f5fcc8bf17d59a04b2710' 
  AND token = 'AuxDwvocyW28pbdq0vukmThBjPINpxCAOIJUET4c5pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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