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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdaec4b5cfcbd74e13ce00af0d80ad546d676ddd2f915541ff61751afdef9023' 
  AND token = 'W7VB+x+60WVhaunLK2Pnm+9Yep5RNpAs01Wd0MNe7X0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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