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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2383c2f32fe7892e7345f26f3cbd73aaae18c83e196b19d748b85949e164b5b1' 
  AND token = 'ax8y19aUDZfAaTGgpzuzf7b2nOHcFEMlZDI7Ow1B32g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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