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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae0c2cdafcc2cdf5c9da160b4afcdb72c870a56d03a1685f5a258d4828db855' 
  AND token = 'Oe58oOb/XkBpwL/Hska7GGia5Rlso4ZEK1esH1/YDvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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