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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '979b014892a50631403131d17ac222ccab548fba49dbec9af94e0205000f20b1' 
  AND token = '+yUIBEBOT8m1ZWz5FsTo5HNMLJgpc/LNmZUt64pWINM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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