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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2206bc88590d868e0cb4854cb26e64ec8d9c210b16d993ef495b94fe04e5dc7c' 
  AND token = '/hL5HDcqndN3exk2zit1m9KS93XJa+P8vWXMgB2gDnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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