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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9465f317ebf8ba49f45c1202f1eda9f4aee3969c9c80343ce1cf59dac58c934f' 
  AND token = 'bLC9z22tYtiGluRxfk7HjXYu07fzEgvH+7gbxxO9yg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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