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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e46f3ec3d8820e39c856cf1e991f3dfefb8350dd397e3291f35c9eb0d2f1bef' 
  AND token = 'y7djTiZoZfp53+8r1fzIduQ7o1HErTPx5NrEXv/AXaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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