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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4a55cb8174d275d48d85bcb6d3695f8974a94b28c2e18cec66cec31bf768afd' 
  AND token = 'qwYo8TiBqYuYH+DK2n5IOp7jPD/Q3neSeTogmul3XNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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